Question

The temperature at noon was : -− 3 ∘C. By 10 pm on the same day the temperature decreased by 5.4∘. What was the temperature at 10 pm?

A) -8.4°C
B) -7.6°C
C) -10.4°C
D) -1.6°C

Answer 1

The temperature at noon was -3°C, and it decreased by 5.4°C by 10 pm. By subtracting the decrease from the starting temperature, we find that the temperature at 10 pm was -8.4°C.

Step-by-step explanation:

The student is asking about changes in temperature, which is a mathematical calculation involving negative numbers.

To find the temperature at 10 pm after it had decreased by 5.4°C from the noon temperature of -3°C, we simply subtract the decrease from the starting temperature:

Temperature at noon: -3°C

Decrease in temperature: 5.4°C

Temperature at 10 pm = Temperature at noon - Decrease in temperature

Temperature at 10 pm = -3°C - 5.4°C = -8.4°C

Therefore, the correct answer is A) -8.4°C.